Fort Collins Csu Facilities, Fort Collins, Colorado, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
October Air Quality Analysis
Fort Collins Csu Facilities, Fort Collins, Colorado, United States
AQI Trends: Highest and Lowest
Same Day Analysis (17th October ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 18 of Good air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 17th Oct - 18th Oct 2025
Fort Collins Csu Facilities, Fort Collins, Colorado, United States
6 AM17th Oct 2025
6 PM
5 AM18th Oct 2025
43AQI
7AQI
60AQI
6AQI
In the last 24 hours,
Fort Collins Csu Facilities's AQI reached its highest point of 60 at 2 AM during the Night, while the lowest point, 6, was recorded at 6 AM during the Night between 17th Oct and 18th Oct 2025.
Day & Night AQI Trend : Sep - Oct 2025
Fort Collins Csu Facilities, Fort Collins, Colorado, United States
16°C7/24°C
18°C6/28°C
18°C12/24°C
20°C10/29°C
16°C11/23°C
12°C9/15°C
14°C7/23°C
16°C7/27°C
18°C6/30°C
17°C9/26°C
17°C8/25°C
17°C12/24°C
17°C8/25°C
18°C11/27°C
18°C9/30°C
20°C9/31°C
19°C14/27°C
10°C3/17°C
9°C7/12°C
11°C7/17°C
13°C4/23°C
18°C6/31°C
16°C9/23°C
14°C11/17°C
13°C6/21°C
9°C3/17°C
12°C5/21°C
14°C7/22°C
14°C8/21°C
11°C3/19°C
--°C/°C
34AQI
25AQI
33AQI
26AQI
2025 Days Vs Air Quality
Fort Collins Csu Facilities, Fort Collins, Colorado, United States
94%
273
6%
17
Total number of days with different AQI categories in last 291 days in 2025 (74 days remaining)
Under WHO’s Safe Air Quality Limits: 94%
Health Risk Level:
Very Low
In 2025, 94% of 291 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Fort Collins Csu Facilities, Fort Collins, Colorado, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
38AQI
33AQI
48AQI
33AQI
25AQI
40AQI
37AQI
46AQI
24AQI
25AQI
25AQI
21AQI
21AQI
23AQI
29AQI
39AQI
38AQI
19AQI
31AQI
23AQI
37AQI
19AQI
24AQI
26AQI
19AQI
38AQI
54AQI
47AQI
42AQI
32AQI
33AQI
22AQI
20AQI
26AQI
48AQI
44AQI
24AQI
27AQI
27AQI
22AQI
21AQI
40AQI
31AQI
40AQI
46AQI
41AQI
37AQI
35AQI
37AQI
29AQI
38AQI
26AQI
27AQI
21AQI
16AQI
13AQI
16AQI
18AQI
21AQI
23AQI
25AQI
27AQI
18AQI
16AQI
17AQI
15AQI
19AQI
16AQI
22AQI
20AQI
22AQI
23AQI
22AQI
16AQI
15AQI
19AQI
17AQI
15AQI
22AQI
14AQI
16AQI
14AQI
16AQI
19AQI
32AQI
35AQI
31AQI
21AQI
21AQI
43AQI
16AQI
18AQI
17AQI
22AQI
31AQI
27AQI
34AQI
27AQI
44AQI
46AQI
48AQI
39AQI
27AQI
23AQI
34AQI
32AQI
20AQI
13AQI
28AQI
32AQI
16AQI
24AQI
33AQI
53AQI
16AQI
22AQI
39AQI
16AQI
18AQI
17AQI
14AQI
17AQI
21AQI
23AQI
24AQI
21AQI
24AQI
36AQI
28AQI
28AQI
26AQI
22AQI
30AQI
32AQI
14AQI
14AQI
18AQI
30AQI
13AQI
13AQI
14AQI
21AQI
30AQI
37AQI
16AQI
22AQI
34AQI
18AQI
21AQI
24AQI
23AQI
25AQI
17AQI
20AQI
38AQI
41AQI
23AQI
20AQI
29AQI
36AQI
35AQI
28AQI
28AQI
32AQI
32AQI
26AQI
27AQI
25AQI
26AQI
31AQI
29AQI
32AQI
32AQI
34AQI
49AQI
37AQI
30AQI
31AQI
35AQI
34AQI
28AQI
30AQI
30AQI
28AQI
25AQI
32AQI
27AQI
30AQI
31AQI
31AQI
28AQI
32AQI
54AQI
45AQI
36AQI
32AQI
42AQI
48AQI
46AQI
41AQI
33AQI
32AQI
30AQI
26AQI
28AQI
30AQI
38AQI
30AQI
30AQI
44AQI
43AQI
51AQI
48AQI
36AQI
26AQI
36AQI
56AQI
86AQI
66AQI
56AQI
47AQI
37AQI
41AQI
39AQI
41AQI
44AQI
48AQI
52AQI
29AQI
32AQI
22AQI
36AQI
44AQI
36AQI
43AQI
41AQI
47AQI
46AQI
40AQI
26AQI
44AQI
41AQI
37AQI
38AQI
44AQI
53AQI
68AQI
75AQI
69AQI
56AQI
31AQI
32AQI
31AQI
28AQI
20AQI
15AQI
15AQI
21AQI
23AQI
16AQI
18AQI
28AQI
32AQI
23AQI
18AQI
18AQI
27AQI
28AQI
20AQI
30AQI
30AQI
12AQI
18AQI
24AQI
36AQI
37AQI
34AQI
16AQI
18AQI
57AQI
62AQI
44AQI
42AQI
52AQI
30AQI
14AQI
30AQI
46AQI
38AQI
18AQI
32AQI
29AQI
21AQI
28AQI
23AQI
30AQI
35AQI
43AQI
31AQI
35AQI
No. of days
202530AQI
Highest AQI recorded in
August43AQI
Lowest AQI recorded in
March21AQI
202427AQI
Highest AQI recorded in
October41AQI
Lowest AQI recorded in
May15AQI
202326AQI
Highest AQI recorded in
January40AQI
Lowest AQI recorded in
April18AQI
202228AQI
Highest AQI recorded in
August38AQI
Lowest AQI recorded in
July20AQI
202135AQI
Highest AQI recorded in
August59AQI
Lowest AQI recorded in
May24AQI
202039AQI
Highest AQI recorded in
September63AQI
Lowest AQI recorded in
June20AQI
Most & Least Polluted Years Over the Last 6 Years
Fort Collins Csu Facilities's annual 2025 AQI (30) shows an average percentage change of 1.6% (worsened AQI) compared to previous years: 2020 (39), 2021 (35), 2022 (28), 2023 (26), 2024 (27).